In Islamic tradition, it is recommended for a person who sneezes to say “Alhamdulillah” (Praise be to Allah) as an expression of gratitude to Allah. It is also recommended for those who hear the sneeze to respond with “Yarhamuk Allah” (May Allah have mercy on you) to the one who sneezed. However, this response is directed toward the person who sneezed, not to oneself. When you sneeze and say “Alhamdulillah,” it is a way of thanking Allah for various reasons, including the relief that sneezing often brings. The response “Yarhamuk Allah” is a way for those around you to supplicate Allah’s mercy upon you in response to your sneeze. So, when you sneeze, it is not prescribed in Islamic tradition to say “Yarhamuk Allah” to yourself, but rather it is a response that others should offer to you as a gesture of goodwill and supplication for Allah’s mercy.